Agile Web Development with Rails 7.2

Iteration G1: Capturing an Order

An order is a set of line items, along with details of the purchase transaction. Our cart already contains line_items, so all we need to do is add an order_id column to the line_items table and create an orders table based on the Initial guess at application data diagram, combined with a brief chat with our customer.

First we create the order model and update the line_items table:

depot> bin/rails generate scaffold Order name address:text email \
         pay_type:integer
depot> bin/rails generate migration add_order_to_line_item order:references

Note that we didn’t specify any data type for two of the four columns. This is because the data type defaults ...